ARCHIVED REPORTS_XR0010558 - Laserfiche WebLink

Home Browse Search

S E C ® R Circle K 8671 March 9, 2006 Page 3 Based on TRC's Quarterly Monitoring Report dated February 14, 2006, the following maximum concentrations were reported as follows TPPH 2,100 pg/L (MW-1) Benzene X25 pg/L MTBE 2,900 pg/L (MW-4) MTBE concentration trends in the shallow zone range from stable to increasing Deep wells MW-7, MW-8, and MW-10 were reported as non-detect for all analytes Groundwater direction in the shallow zone was to the northeast at 0 001 ft/ft and in the deep zone was to the east at 0 001 fvft REMEDIATION STATUS A soil vapor extraction (SVE) pilot test was conducted during the 2nd Quarter 2005 A report documenting the pilot test results was submitted in the 3`d Quarter 2005 Interim ozone sparging will begin upon approval by the Regional Water Quality Control Board CHARACTERIZATION STATUS Contamination in soil has been adequately delineated TPPH and benzene have been delineated in groundwater both laterally and vertically MTBE has been delineated in groundwater laterally and vertically with the exception of delineation to the northwest in shallow groundwater •� CONCLUSION AND RECOMMENDATIONS Based on groundwater concentration vs time graphs provided by TRC, MTBE in the shallow zone has started to decrease or stabilize in all wells except MW-4 SECOR completed a SVE pilot test and submitted the results in the 3rd Quarter 2005 SECOR also recommends continued monitoring to verify contaminant concentration trends at the site RECENT SUBMITTALS/CORRESPONDENCE January 9, 2006 —Quarterly Status Summary Report— Fourth Quarter 2006 THIS QUARTER ACTIVITIES (First Quarter 2006) 1 TRC performed quarterly groundwater monitoring and sampling 2 SECOR submitted quarterly site status report NEXT QUARTER ACTIVITIES (Second Quarter 2006) 1 TRC to perform quarterly groundwater monitoring and sampling 2 SECOR to submit quarterly site status report 3 SECOR to prepare bench scale test for ozone sparging LIMITATIONS •